Al principio tienes suficiente con esta fuente, tiene un unico carril de +12V 52A.
Radeon HD 5870
* The card requires you to have a 500 Watt power supply unit at minimum if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 40 Amps available on the +12 volts rails.
Radeon HD 5970 (dual GPUs)
* The card requires you to have a 600 Watt power supply unit at minimum if you use it in a fairly high-end system. We assume you'll overclock your processor and that draws a lot of extra power. That power supply needs to have (in total accumulated) at least 50 Amps available on the +12 volts rails.
Pero no se sabe lo que va consumir las Fermi.
La caja Nox coolbay HX no es tan pequeña y puedes esconder perfectamente los cables para poder pillar una no modular, como la Corsair TX850 850W por 8eur mas y a cambio tener un unico carril de +12V 70A.
Un Saludo.